I''m not Jeff, but I''ve read about and seen the characteristics that distinguish a ''true'' cutter from a ''sloop''.

A true cutter will have the mast set farther (nearly mid-way) back than a sloop, which usually has the mast set about 1/3 way back from the bow. So, if one only removes a cutter''s mid-forestay - that in-of-itself will nott make the boat a ''true'' sloop.

Also, the boom on a cutter will likely be a bit shorter than on a similar sized sloop. Thesw sail size and location differences will have a large effect on where the center of force is located, and thus on the boat''s performance and sailing efficiency.